List the difference between external and …

There are two main parts in the respiration:

Aerobic and Anaerobic respiration:

• The breakdown of glucose food occurs with the use of oxygen it is called aerobic respiration. The glucose food is completely broken down into carbon-dioxide and water with the use of oxygen and energy is released. All the living organisms like birds, lizards, snakes, earthworms, insects and most of the plants carry out this respiration.
• The breakdown of glucose food occurs without the use of oxygen it is called anaerobic respiration. The microscopic organisms like yeast and certain bacteria obtain energy by anaerobic respiration. In the absence of oxygen, glucose breaks down into alcohol and carbon dioxide. Yeast is a single celled organism. It is used to make alcoholic drinks and bread. Yeast converts glucose into alcohol. This alcohol is used in making wine and beer. It also produces carbon dioxide gas which makes the bread rise. Anaerobic respiration produces much less energy because partial breakdown of glucose occurs in absence of oxygen.